札达土林分布区地质景观遥感提取

Remote sensing-based information extraction of the geological landscape in the Zhada earth forest distribution area

札达土林位于西藏自治区札达县和普兰县境内,主要由托林组及香孜组弱固结-半固结的碎屑岩构成,受河流及雨水的长期冲刷侵蚀,形成了峰丛林立、沟壑纵横的特殊地质景观。为进一步发掘札达土林分布区的旅游资源,充分展现研究区内地质景观的科学价值、美学价值,主要利用高分一号卫星遥感影像开展工作区地质解译工作,重点解译构成土林地貌的香孜组、托林组地层及能够指示板块俯冲作用的蛇绿岩、构造混杂岩。根据解译成果,依托“航空物探遥感多元数据加工与产品展示平台”提供的三维解译环境,提取研究区土林地貌、岩石类型、断裂构造等典型地质景观。遥感技术的应用更加准确地圈定了土林的分布范围,三维展示平台使土林地貌、洋壳残余、不整合界线等代表区域沧海桑田剧烈变化之演化历史的地质遗迹更加生动形象地展示在荧屏之上,利用现代信息化技术为札达土林世界地质公园的整体规划部署提供有力支撑。

The Zhada earth forest,located in Zhada and Pulan Counties,Tibet,is composed primarily of weakly consolidated to semi-consolidated clastics s of the Tuolin and Xiangzi formations.This area forms a unique geological landscape consisting of peaks and ravines due to the long-term erosion by rivers and rain.To further explore the tourism resources in the Zhada earth forest distribution area and fully reveal the scientific and aesthetic values of the study area,this study carried out the geological interpretation of the study area mainly based on the GF-1 satellite remote sensing images,with the interpretation focusing on the Xiangzi and Tuolin formations constituting the earth forest landscape,as well as ophiolites and tectonic melanges reflecting plate subduction.Based on the interpretation results and the 3D interpretation environment of the Aerial Geophysical Remote Sensing Multivariate Data Processing and Product Display Platform,this study extracted information on typical geological landscapes in the study area,including earth forests,various rocks,and fault structures.The remote sensing technology helped delineate the distribution range of the earth forest more accurately.The 3D display platform enabled the more vivid display of the geological relics that represented the dramatic changes in the regional evolution history,such as earth forests,oceanic crust remnants,and unconformities.The application of modern information technology can provide strong support for the landscape planning of the Zhada Earth Forest National Geopark.